Title:
METHOD AND APPARATUS FOR CONCENTRATING METHANE IN ANAEROBIC DIGESTIVE FERMENTATION GAS
Document Type and Number:
WIPO Patent Application WO/1997/016399
Kind Code:
A1
Abstract:
A methane concentration method for removing carbonic acid gas from an anaerobic digestive fermentation gas and concentrating and recovering methane by using an apparatus (10) including a pre-stage module (11) with a membrane (11a) and a post-stage module (12) with a membrane (12a) connected in series. According to this method, an anaerobic digestive fermentation gas is supplied under pressure to the pre-stage module (11) through a compressor (14). The gas passing through the pre-stage module (11) is discharged by a vacuum pump (16), while the gas remaining in the pre-stage module is supplied by a residual pressure to the post-stage module (12). The gas passing through the post-stage module is returned to the pre-stage module (11) through a recycling pipe (18), and the gas remaining in the post-stage module (12) is recovered as concentrated methane gas having a concentration of at least 90 % at a methane yield of at least 85 %.
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Inventors:
INOUE MASAHIRO (JP)
HARUNA KAZUO (JP)
HARUNA KAZUO (JP)
Application Number:
PCT/JP1996/003050
Publication Date:
May 09, 1997
Filing Date:
October 18, 1996
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
INOUE MASAHIRO (JP)
HARUNA KAZUO (JP)
INOUE MASAHIRO (JP)
HARUNA KAZUO (JP)
International Classes:
B01D61/58; B01D53/00; B01D53/22; B01D63/02; C07C7/144; C07C9/04; C10L3/10; (IPC1-7): C07C9/04; B01D53/22; B01D61/58; C07C7/144; C10L3/00
Foreign References:
| JPS6153994A | 1986-03-18 | |||
| JPH0525482A | 1993-02-02 | |||
| JPS51147480A | 1976-12-17 |
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